Alarm mechanism



June 3, 1941. w, p cc m 2,244,431

ALARM MECHANISM Filed July 19, 1939 Alfred hzPz lccardi:

INVENTOR ATTO RNEYS Patented June 3, 1941 UNETED STATES PATENT OFFICEALARM MECHANISM Alfred W. Piccardi, New York, N. Y. Application July 19,1939, Serial No. 285,395

4. Claims. I (01. 116- 90) The present invention relates to a new andimproved alarm mechanism especially adaptable for use with windowswhereby an alarm is sounded upon unauthorized raising or lowering of thewindow.

An important object of the invention resides in the provision of analarm mechanism carried by the lower sash of a window with a portionthereof in contact with the side rail of the upper sash whereby theraising of the lower sash or lowering of the upper sash will sound thealarm.

A further object of the invention is to provide an alarm mechanismembodying means for preventing contact of the same with the upper sashwithout removing the device from the lower sash.

A still further object of the invention is to construct an alarmmechanism of the character described, in a very simple, economic anddurable manner and one that may be easily applied to and removed fromthe window sashes.

The invention will be fully and comprehensively understood from aconsideration of the following detailed description when read inconnection with the accompanying drawing which forms a part of theapplication.

In the drawing:

Figure 1 is a vertical sectional view of a portion of a window with thealarm mechanism associated therewith.

Figure 2 is a front elevational view of the same.

'Figure'3 is a front elevational view of the interior of the alarmmechanism with the gong removed and with a portion of thesupportingplateshown in section. V

Figure 4 is a detail sectional view taken substantially on line 4-4 ofFigure 3.

Figure 5 is a fragmentary exploded perspective view of one of thestriker arms, and

Figure 6 is a perspective view of one of the cam members forming a partof the alarm mechanism and removed therefrom.

Referring to the drawing for a more detailed description thereof, thereis disclosed a portion of a window frame comprising an upper sash A andlower sash B. The improved alarm mechanism generally designated by thereference numeral 8 is adapted to be attached to the upper end of themeeting rail 9 of the lower sash B and may be disposed at either theright-hand or left-hand side so as to have contact with the side rail [0of the upper sash A.

The mechanism is attached to the upper end of the meeting rail 9 of thelower sash B by means of a plate H, the same being secured to the rail 9by any approved fastening means I2. As more clearly shown in Figure 1 ofthe drawing, the plate is disposed on the rail 9 so that one end l3thereof lies flush with the front face of said rail. The end I3 isformed with parallel sides M for receiving therebetween an arm l5, saidarm being pivotally attached to said sides as indicated at l6. The armI5 normally inclines toward the side rail ill of the upper sash in orderto maintain the alarm mechanism in contact therewith, said alarmmechanism being carried by'said arm in a manner to be hereinafterdescribed. For maintaining the arm l5 in a vertical position so that themechanism is out of contact with the side rail ii], there is providedthe lever ll pivotally connected at 18 within a slot l9 formed in thearm. The lever H is formed with a shoulder l8 adapted to engage aprojection l9 formed on the end I3 as shown in Figure 3. A tensionspring 20 attached to ears 2| and 22 projecting from the arm l5 andplate II, respectively, normally urges said arm toward the side rail 10.

The upper end of the arm I5 is interiorly threaded for receiving thethreaded end 23 of a shaft 24, said shaft extending at right angles tosaid arm. The shaft 24 forms a support for the flanged plate 25, saidplate being formed with a hub 26 through which the shaft extends formaintaining the plate spaced from the arm IS. A rubber or the like ring21 is carried by the flanged plate 25 representing that portion of themechanism in engagement with the side rail Ill of the upper sash A.-

The plate 25 is formed with a series of slots 28 and 29, respectively,the slots 28 receiving the members 30 and the slots 29 receiving thetension springs 3!. The plates 30 serve as camlike members to be engagedby the strikers 32 as the plate 25 revolves about the shaft 24. Theshape of the plate or cam-like members 39 is more clearly shown inFigure 6 of the drawing and it will be noted that the same is formedwith a fiat surface 33 for engagement with the back of the plate 25 anda raised portion 34 adapted to extend through the slot 28. The members30 are pivoted intermediate their ends as indicated at 35 to the plate25 and the opposite end thereof is formed with a hook-shaped portion 36for receiving one end of the tension spring 3|. The opposite end of thetension spring 3| is attached to the end of the slot 29. The members 30will swing about their pivots 35 the width of the slots 28 against thetension of the springs 3|, said members being moved by engagement of thestrikers 32 as the plate 25 is revolved in an anti-clockwise direction.

The striking mechanism is in the shape of a pronged spider, the centralportion of which is formed with a rectangular-shaped slot 31 receivableon the flattened end 38 of the shaft 24 and resting against the hub 26as shown in Figure 4. Each arm 39 has its end slotted as indicated at 40and threaded as indicated at 4| for receiving the flexible spring 42 andstriking element 32, the striking element being held within the spring42. A gong 43 is attached to theshaft and completely encases thespider-shaped striking mechanism.

In use of the mechanism and when desiring to have the alarm sound uponunauthorized opening of the windows, the lever I! will be disengagedfrom the projection IS in order that the flanged wheel may have contactwith the side rail 10 as shown in full lines in Figure 1 of the drawing.Raising the lower sash B will cause the flanged who 25 to rotate in thedirection of the arrow 44 at which time the striking members 32 willride over the portion 34 of cam-like members 30 which project throughthe slots 28 and as the striking member becomes disengaged from saidprojecting portion will strike the gong 43 sounding the alarm.Thestriking members 32 and cam-like members 36 are arranged in such amanner that as one striking member passes over one projection anotherstriking member is becoming engaged with another projection whereby asubstantially uninterrupted alarm will be sounded. The spring E2 beingflem'ble will become distorted as the striking member 32 engages theface of the projection 34 as indicated at 45 in Figure 3 of the drawingand when leaving said projection will spring back into shape therebycontacting the gong 43.

Also it will be understood, of course, by those skilled in the art, thatvariations in the hereinabove described device involving thesubstitution of substantial equivalents for the devices described areintended to be comprehended within a the spirit of the present inventionand that the invention is capable of extended application and is notconfined to the exact showing of the drawing nor to the preciseconstruction described and, therefore, such changes and modificationsmay be made therein as do not affect the spirit of the invention norexceed the scope thereof as expressed in the appended claims.

What is claimed is:

1. An alarm mechanism for use with upper and lower window sashes,comprising, aplate adapted to be attached to the upper face of themeeting rail of the lower sash, anvarm. pivotally attached to saidplate, a shaft extending at right angles to said arm, a flanged platemounted for rotation on said shaft adapted for contact with the uppersash, cam-like members supported within said flanged plate, a strikersecured to said shaft adapted to engage said cam-like members uponrotation of said flanged plate, and a gong supported on said shaft forcontact by said strikers when disengaged from said members.

2. An alarm mechanism for use with upper and lower window sashes,comprising, a plate adapted to be attached to the lower sash, an armpivotally attached to said plate, a shaft extending at right angles tosaid arm,'a flanged plate mounted for rotation on said shaft adapted forcontact with the upper sash, said flanged plate being formed with aseries of diagonally disposed slots, camlike members supported withincertain of said slots, flexible strikers secured to said shaft adaptedto engage said cam-like members upon rotation of said flanged plate, anda gong supported on said shaft for contact by said strikers whendisengaged from said members while moving one sash relative to theother. V g

3. An alarm mechanism for use with upper and lower window sashes,comprising, a plate adapted to be attached to the lower sash, one end ofsaid plate being formed with vertical extending side walls, a projectionon the end of said plate, an arm pivotally attached to said side walls,means carried by said arm having contact with the upper sash forsounding an alarm upon raising said lower sash or lowering said uppersash, and means for maintaining said first-mentioned means out ofcontact with said upper sash, said second-mentioned means comprising alever pivotally connected to said arm and formed with a shoulder portionfor engagement with the projection on the end of said plate. 7

4. An alarm mechanism for use with upper and lower window sashescomprising, a plate adapted to be attached to the upper face of, themeeting rail of the lower sash, an arm pivotally attached to the saidplate, a shaftextending at right angles to said arm, a flanged platemounted for rotation on said shaft and adapted for contact with theuppfir sash, said flanged plate having an enlarged central hub portionthrough which said shaft extends, a member having a central sectionmounted on the end of said shaft and formed with a multiplicity ofprong-shaped arms, flexible striking elements mounted on each of saidarms, cam like members supported within said flanged plate, saidstriking elements adapted'to engage said cam like members upon rotationof said flanged plate, and a gong supported on said shaft for contact bysaid strikers when disengaged from said members.

ALFRED W. PICCARDI.

